<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
   <style>
    body{
        width: 165px;
        height: 925px;
        background-image: url(img/16.jpg);
        background-repeat: no-repeat;
        background-size: 1655px 1000px;
    }
    #one{
        width: 450px;
        height: 200px;
        border: solid 2px white;
        position: absolute;
        margin-left: 550px;
        margin-top: 360px;
        color: rgb(255, 255, 255);
        font-size: 30px;
        padding-left: 30px;
        padding-top: 30px;
        font-family: Arial, Helvetica, sans-serif;
        background-image: url(img/16.jpg) ;
        background-repeat: no-repeat;
        border-radius: 15% 15%;
        box-shadow: 0 0 45px rgba(0, 0, 0, 1);
        background: transparent;
        backdrop-filter: blur(1.5px);
        -webkit-backdrop-filter: blur(1.5px);
       
    }
    input{
        width: 400px;
        height: 30px;
    }
    button{
        width: 150px;
        height: 30px;
        margin-left: 132px;
        font-size: 17px;
    }
    
   </style>
   <script src="jquery-3.4.1.min (1).js"></script>
</head>
<body>
   <div id="one">
    账号：<input type="text" name="user" class="two"><br>
    密码：<input type="text" name="password" class="three"><br>
    <button value="提交">提交</button>
   </div>
</body>
<script>
$(document).ready(function (){
    $("[name=user]").focus(function(){
        $(this).css("background-color","rgb(246, 243, 198)");
        $(this).css("color","white");}).select(function(){
        $(this).css("font-size","16px");});
  $("[name=password]").change(function(){$(this).css("background-color","rgb(247, 246, 241);");});
  $("input").focusout(function(){$(this).css("color","black");
    $(this).css("font-size","10.5px");
  });
})

</script>
</html>